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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf096a36d0bf221bfd53b2a9ed90d93f24cb40781ee9f64279759314a916ffb8' 
  AND token = 'CeMZRLjlE6ByO9Y1N4B559PaAH/2YSxnx//3eUKf7uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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