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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e6e463db093dd06c41e4f08a368830c5b4ffd573ba9d403acb6a803da7e3e26' 
  AND token = 'madXuHh6ecioP3lO6eLjd1u9xnwfuKCkviwaj7wOt+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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