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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b64b76af1ccf1566e9c9b33794d35a1d9cfe9fb561997ecf4ceb3841e89d71ca' 
  AND token = 'l6Tj4CdaW0yg00skjoLCXIIZi3KGRfgTq8hrc716dRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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