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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5816742c79a8e2c351efd9b35333d5f95abe0d48656184118199b1d79f30ab49' 
  AND token = 'M9JsSYx1DDPDyxO2ajTbtZ77SdSI2k5KFqZaT6m4XDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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