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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e61e3ce0caedd1ab8712b745b2fa22d0b99cc528e460cbe5ecd3561273bd6e33' 
  AND token = 'nTvx23BklAY3/oT4d6hpYYldXE/DZ/VzkrteHPPk50Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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