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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5b8270d2a3814b31a516df157abde1c8bf0c32f7e8492aa79f224123606d265' 
  AND token = '7Vg7Fw7EY1R12Zz2XsZEOg3go6T8lwCQmb4Fxh8AEAo=' 
  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"
    }
  }
}