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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f2b411cd7c60c77ce468aef9284f7e284a9f0a0b8fa14d11a6eb5becc38a8a' 
  AND token = 'ZS2deQHsjQhoJI27pa+tgMOimf8JJcYX/wJGSP9gHe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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