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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b8609d06fac00aeb21d77387fba1aaf7c4adf0c73406363018d1bba43b314c8' 
  AND token = 'dHU/fbpW1N6LrA5dBqBfQ+5txuIzQKJd8NP22L6DDJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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