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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1bb9b6eced6b65acb1aaf3a50495c8a90fae838ce4a7dac99439cffca7b61b5' 
  AND token = 'Kq6zptWF26uqaGXIYeh7jpsQ1XToWf83PVvwn7+PeaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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