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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e769202b952b333ba38ceb15d5f355fef1d4fa7e2eb8fe3e388ba6e4012e2015' 
  AND token = '3Kg1iz0oSHQbj6TpEUsHxEF0aROnS4NqpDQ7oBgdv0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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