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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e2ef01427ed2eb60240af21aac2e61f3bf3784e9681fa14c461181951840d13' 
  AND token = 'JcQ+x0jtcM+d99ilEHZWhT7OOHLm2rVn7ZoBvNhUP+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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