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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db22ecd100c0da02b3aff8f5122d71f9bd2e9ae00d33f0da7513f189d0f11777' 
  AND token = '9y4uci5N8CPKMUzp76zJ48tshtY6XevW+q3SUIEPkHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}