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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77bb498d96e972d51ea39fea27407b14bd442c4e87bc1ffef47ca521ce9c6289' 
  AND token = 'bF2UgZF71IC+DN1FARokIz/nur8oRCoEApNWVU8AUaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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