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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d4647bf39f721aa297d46cf2d5c8950a5ac2b7280bc35387cb5b93f8482443a' 
  AND token = '6bhZFZOpvtyijf81NA4ToITzjP8zlyW7F4k/tPki2OI=' 
  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"
    }
  }
}