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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be029b123d7673b9f56dbbc819f87067568e0651f9b0e0a96172d4915169b23a' 
  AND token = '8lsvP6rhywh4zJ5KpA13xoJCUbE4a7TEaN3AYlLq99U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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