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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c573af7fd841cd4147ba81f8abe29a6a7b68fc9970dbdbeff58f316473bb84f7' 
  AND token = 'ESpQ9ohgf8BCau1SJU74KUkoU1nVzs2noLgDD+vCTT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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