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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '519ee06febc9a4b206a01aa0fa7b6b3e95cc7c61c1f28fefc60cf88b563cb6bb' 
  AND token = 'N0ab+mQf6kPbGRM6Ii6qJU86K+aVzgokg/cFMSiX26Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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