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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd43d236c7aaf3ce4642b81d969d5df09ab9766d890068fbfa86f2e71a3133902' 
  AND token = 'EUA0IxkkpFG3jKvme/kE8hmR5mC3lceJim1X9t5Tkiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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