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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12a415581e491dc368410378b39af235a9e0a3abca1f7f4c32c898a1203fd474' 
  AND token = 'JfZAtOYTVFg2EMCnvwmOVGSO7ZjJ0v/SAAubJcCuuQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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