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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26236349aa31e8c3c9f9466fd3292c0ddf659d76723d552dee156c6e9998b123' 
  AND token = 'UwJWCNWwyMljyT77+RZrooeNTPnYSE8t+G0vsrGLjDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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