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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f43588a3e406fa0823a8bec8350dd7e5019b132766a61372eb0d16d0e41a51' 
  AND token = '4GM3a0IWVfFFWyRp/J2/VLuUXJ70xsoM8r4fEpMpcDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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