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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2704e150a13e4558103cd1e766a08a53f73de84139362f7a75c8545432a35c9' 
  AND token = 'qE6LbrBJcUdCs5N78zgwxUFMa3dCrsdiYVuFl+KGmQE=' 
  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"
    }
  }
}