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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '701208bb9708bc9669b505a760644944e1ddd4b3a648b932c108ed6ee8b85611' 
  AND token = 'uFVkCOhA3oTY8h01BrawgjRM2hadQTnt70zGYfGn60Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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