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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9d92e0ca78219e2e218b2229c00b709c2180239401adc9710cad3c3a5f5745a' 
  AND token = 'iJNgt7CXqcvq9g20nMS+1I5RC997dpp4w3eWKI4ZfYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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