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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42a48bd7f4179497c9cfc2b641786c7adb6f35e3cf632802c24337b79eec1a07' 
  AND token = 'cvDkRLi7PRI78tieBKpMts5aKGd8N/aW/l/w7G61x3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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