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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc213a953110e32f3f9206503b7a0b9c37046f4ae2b67eb6086a4f7c1a8cf4bc' 
  AND token = 'mfzOnB0d8QkivllhLiJYVypT3okeYKhl13A0M7lUWrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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