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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3d4f8116bc17f584c551931541a395e7d1c33f619ad35b2efacf25ba5b08d6e' 
  AND token = 'RNR3JqDqrHRgf22mp55/P85aozceW4PltIUO9RXhY9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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