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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ba016c6c33d7a841e462855418e0a3025453c75923494d8d7621aa4232e24f2' 
  AND token = 'wxzhRWZM50eDeayKRk63VSGE9uTqRExzaGMXc1eQcWQ=' 
  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"
    }
  }
}