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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61c42917b2e4e2a0bab9baac376b9831113d0af83cebd6364db722612ebe3e7f' 
  AND token = '4VFzZtAAnLh7B4rNBiR2xt/v/NY7McNJstYJ4ODuVII=' 
  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"
    }
  }
}