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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fc3ff7054b121b12ba3a05b5703d0201a5a205518a20880a73293de3134be85' 
  AND token = 'D+54duyap1a5ZDXeLHZI7UDxhmUfqfCHVLT8cCiGIAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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