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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e72c78306313c0ee5f9076e55c07b65a79822204392a8a6da16e3738f33dc1cd' 
  AND token = 'zkAD/avS3AEBFF03rK8raISSyxjQoC6pIpCjD1t26KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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