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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ef9585957ff8efc1b99fe7c143a6934411629518e75402147c778ff52aa556' 
  AND token = 'KaCEY6VEbFfS0Df7GaN1NTJKJRIvj1iAWac2vvf1Ea0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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