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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88098fbe5c851275e15269c673417870a91ef791178e9916fa7908e783f4f3d9' 
  AND token = 'aqXogHv0C8ynApQ2UUOiuubdTi0eYSz/t2n/KAzuVg0=' 
  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"
    }
  }
}