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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f81a34f60152f96de322c92656dd303fe96d0bc0bc122238f4e01def083e1cdb' 
  AND token = '5j4qbfM0n5LC1yJ2hwSsfdqULwbhIkkebM/v/Yvu2SE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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