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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b744414b29e53933ff959781d67449c1e149a4d5b0e25d55a980b57b3aaf6908' 
  AND token = 'u9MCt3BmsdAtSvV1ahzoJapptNEycSnzeeJtgQ8p5lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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