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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e546b9f53f4c03ebb0f24b01dd17406041472ae36235b6d406927e2b27438b5' 
  AND token = 'HAtlz5GA4g5XjOHJqFhZnhNnM0vzAccvGdFRz86ghis=' 
  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"
    }
  }
}