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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0dbfb5e908ec1dd2fb2abc70e43e1ff91094c3411015534b49c33d50c9aa97' 
  AND token = '/rH2tA2nI81dSaPr+KS5wBtLWsqZGeG4u+sHA3t2VDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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