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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99adfe6437ef15936d1b8ae14245d9edbe1d71e78e63e0ca72d1b3988654eec4' 
  AND token = 'uVOH+v26AMz0vku69Yc7v/U0vU+xtjA7hPrBEyxZ0Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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