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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43f2257cd4275aedd575b798dfca023636cea54057b4c7bb72eb0f3c8c4e8c02' 
  AND token = 'xPbgccBC6M2L4bAMHIlIgPmc2j+XPneIuDffogjHyZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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