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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db9dc5da9908725e0b974a5bdc923c7306428c4d4cdcfc31ba5f9f315b0d839f' 
  AND token = 'ci5Yz0MchA+XC7MqD6KVg1JSiz4cttulFqnMGmveMtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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