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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd7744780e7c87d1c5f7367d6bb9f8b81377cebf06c23cd7c9ff95995b5f0183' 
  AND token = 'FBXSwiym5kkg+ec22ecsXlMrxp84NdyPl/XpsDFdp50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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