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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97a7c1aa276e6a78769ecebc6409a1c4f29d9df663c3dbe941c95f22264adce' 
  AND token = 'TP6paLGPstOd5oDRGwBk7ny4/OHhj2YHe2E7Eld07XA=' 
  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"
    }
  }
}