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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d6fbe8b69f605042e5939e25339bfc0a960b25d840e8bd6303dbbd7f401006' 
  AND token = 'oDyGM5ZpapRo/0TzGVNAG3XcTeiJ5afDLIv0RF5E/8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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