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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f0040a9065b3257e546120126a7e8d00674fca4a79770bf6ec5bac841cf80f9' 
  AND token = 'ZXcGB59VSpm16+/cspfv3SQXYGcUXd+9XxFaro6lSB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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