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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e2e11de883f58094b8f99a02a3faa1d8a360a0ad5be22c3a8fe6c0b528e8ce6' 
  AND token = 'N4jP65aPmHpXmoDUNH6WyxFAo1tRWIaBWtP/IlW0+6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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