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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e6976cf453599c1d58b868efdc54f68bd99067d85934597ea16cf610462930' 
  AND token = 'Ffd1+dx6isdEQ3en9Q+csvbTWNubTI0nohlk5QkNSGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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