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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7444f76e6e6c5773a7b752a81dfa71d5314dd478b70a3a3dcf00955191deb0a' 
  AND token = 'v5fkh6NUuRxYSFu1yr7Wla5ZlDtlhGnXnH9JtEoFPzc=' 
  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"
    }
  }
}