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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0205db09a2097342f3c77174b430a736cc935902552f0a737310bce31c2cded' 
  AND token = 'RtXUO6pRNVTaIr8CRPp4bFBQGvpq/2WkMEiHmSaVP2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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