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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3dacd7d0aa0e585e85019124f4292fef4940b6d1f92eb979f4998d2ae5a9f19' 
  AND token = 'Nzt2jIL6SUX+ZBvCt4W5l8HCNt/AICh2ahXg4gKrgNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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