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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f17c4551af56111a3529dcc7a4e282aa85cded85c6c604527670e425aceb54be' 
  AND token = 'pkNAaOBRluQgSWoYVOOsRr7GiA3Yic3XndyEUGO6PFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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