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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9c65cebd5cf008e182c0e2a409c7061ce0a012c8cb301de359a3b598022315b' 
  AND token = '/lL2PVKsO5wzipXXqn83V3LegsMvU9BSbwuScyhU3pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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