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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ed754dc8fd2a14011eedc8a915f2a5cc700ee73fd18cffe2faa66d16221e8df' 
  AND token = 'FiH4a9fmpoLfdYR9JQ4Q+d7an7XL/Ugz3vsFwXGNtUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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