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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0967d65d53c50b446f2751a662cbb826a56fcf8d89ef8149af3e0a3457b66616' 
  AND token = 'fcZn6UzgxaCIXdC7b34HN4M1RqTXdwbEF0NAj2oom3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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