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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d7f90d858b6481d0581577d674860d26f09f012ad190f1f868cf7e7d3041f2' 
  AND token = 'C7aMMsNmx5otSEsJZFHOd7PQq/Hfcuu6uJJIoUxv7V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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