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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c75d0486be5143da1b94d7cf78aa80c4869b4964347231cf261672e62c84134' 
  AND token = 'm+feR1TqNNveSMSG9f3OAuaXR/ZiXPdrMLJN87tal6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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