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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee4e28e22dedacb2fcc12a008e5817d8a925e77c72b32f36639fd53ee33caa2' 
  AND token = 'sZKApjIhKlNMZsmWfj9Z9C1ghDRP0OewO4O3yyW+Wdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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