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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c59802d9e8957a7ffa54398da5b586a511a66c0fd3a41f2da72d9007ab52e54' 
  AND token = 'VmNjhd0All5ZUqRrYQAVcfMjFQalIbxA7bSTspBTW5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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