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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db75c8b929904665feacba8bec690a1f9bec851681e06a7ae6ffcf047328b19' 
  AND token = '4gRTGPV1FLmGSYgb3oIagjQ0N/jMRX4suNaPmWoWKWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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